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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '109cfd7b16dad6c3883e686e355cd4e626b4aeb46e2ab890af2a11debe511a35' 
  AND token = 'uwyqaMH20lssqr8+w4ugBtaVxlNbJR+CflQKWMCRejk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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