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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5efa34ecfe53666df493c0ccdbd82ba855430242a7c8f1e08a24f218d7508454' 
  AND token = 'FdVgCM4CoYcGRSI8bJxIltjvmHy9p1ia1uSF3DVtPUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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