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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c3a4eb3493467c77feb42f0169c94148a98d07ded91a7c7e87b57632eed65e8' 
  AND token = 'yDdKDcRdFV5faRZN7gTD9mWajTJCNO9KTAx8A5J5mgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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