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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc6c80bc01d0ce1bdc56b3ec1b98cc1ded15c8a0cd976abcb3c9bf895d9d96d8' 
  AND token = '2CtFv5yleM970r4huzJyCAqVQoS/WCf2hRK99nLq3GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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