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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f447a36059754dcb797ef427776c81f455f0dc91fe2ba891708e3544f5ac1d07' 
  AND token = '0eXQqlO8cJt84RI/Sram5F2WRb+d76+rpyMoqH68sXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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