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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02edb8363d90ed9128eddc60d93ec2995d5bd036c2f26331820f145897c35287' 
  AND token = '186vAiQy8AhLapi+xPPHZFk7mm1VV67KyhXNyVMd4Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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