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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e75018811c2858153c0ea7699b0b0d1b288a6146a6d7c526a463cbc557e3602a' 
  AND token = 'Gc8af8vPaOYX4S3VcXmo094gq0BX+iPPU3ceLGPEW1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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