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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43d784afb1a60b001786915dc29749bf92d228e52f124fb5b8878b11a76d518d' 
  AND token = 'XR7X6KzFVZO8exRZzunWzxOy7Ioc2HnLCPEBb76ZSAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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