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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '548ecc3eb403f48c89cc4c76dbbb28b8ccc518cbcf22f07cbfa8a8a4a3fdd0d7' 
  AND token = 'MpjqJwSsU1D/0PQQ4RL5fPaYZ+4HhIh+Pns7trdnfFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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