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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fe4b0c363efbf132515281386163ed1436e70a019640709391c1b09890c8994' 
  AND token = '5IctbYTqRaXAdpIcLkUFfxP+e7vQ6lD7RO+f8bOK4hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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