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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a37588feaf0ea5290bd1dd464eab5733b3e48404d83b1093a78ac059b78039a5' 
  AND token = 'XMWmfrSFJNWpqyLM3Fii4CkxYm13fttI5yDAd5ayHs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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