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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3ad7ccbde182754def517a54f04687159f779623a9d5489208b474d51985a67' 
  AND token = '/q29wLC8IFfpsov/s5fIV8HDpqdWxDpxcFxWNQdxqQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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