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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee667c84265f28f48f24549cd5220e704a9448eb80875b407457316f16b22788' 
  AND token = 'QrryteUjyqfqJh+uqs9i+c95gylfmcradpQUkfxYDto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}