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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07db45676aba07eff7a674dabdc782df2ff6aefb8b64e778caa91c98ac89c01b' 
  AND token = 'VtxL4G1HlglTRU7PQ4e8KVbZSW9+qzSs/+txwy7do3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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