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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a60e8d475b5ccd3156e303149212c322caa32b5d8c0b7a38d8089f76c7e8cc1a' 
  AND token = 'V47JIPF6dSU4mDDV28mWMS3ACpoQmTzXbv5vl9VLPZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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