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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd610ffa2f5c3afeee312186500d06872f2420661d38f1c17fb4e511ff4e8704e' 
  AND token = 'erhlgkzH/bOWJROqkLrWWwOb7Ek5Qbt2qJmvZ9Nz+bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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