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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b41ef5e1ae2890973e79019b370dd10058e314a783da3b26d6d1aaf3cab10c8' 
  AND token = 'WqTPjI4MAUx6x1Y/32LVqUApYqmDRaokUcCOc5lZ+4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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