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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0259ba9ce28e96870843581006c8510e484218bfd6a82e360b7c9509f6eea55e' 
  AND token = 'iBnOpGxlXqOeMqF16b11Q3nsa6Mta2mDa3LCGce1Cxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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