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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '293a0c0b41595997d3bd6895b45bbe67b444d4f18e212da970ace0ce4b5fbee5' 
  AND token = 'hmYGyGqDTIr2wd6hNR0ASg2K+f5qGh011wMik8279jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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