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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a94d6094521c41c596c4abdc42cfcf57491ad7553774dbfc6a90fd00f52ff455' 
  AND token = 'onvpJ4sop/kbxM7iwj3aHCDc63jK12QE3oawwhn+Fmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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