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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2584fd8e2bb9885fde0a606730d8a9d908bc9fa3da75cf3d138cefe6dedd0fc' 
  AND token = 'KZUIOfIl7Vb6PxkHn8sJWz5G81pAS1qMG4Wflg1vob4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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