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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f87688eb909066beebc0211145e443f6e5f5a29918b9d986c158171606e6267' 
  AND token = 'S2D54WJUdjfSnrfH3/ogs4Gycpga0LF+M/2ViURKS0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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