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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a57607198a63c200917882b5eb10a66e0eccc28cb8dd278ed7f57b611debccb' 
  AND token = '7VW04SD51VUjWBUhrXhh5Rx9K6/NTOxqQGeLY05IcHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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