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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ea8748baa5808a69fbd5eaeaf0932b5dbcc5f179d6ce8f73d5bfb8a834489e1' 
  AND token = 'N0Ida8osP/R9E/0Q9hKdMfcaA+SrCsJtgACcGpH2uzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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