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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3da6e139fd99c449e9e3883ae5d7e64d75806960aea475535ae395f0c1dc77f' 
  AND token = 'T6gLihqenhmntoBtNN44exmAzWDsdjAFr/lFaF2k6YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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