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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2cbf0561af9c79134a47f36fd57b497d90ebc7e335c08188a6b911ed9496718' 
  AND token = 'xNd2cP70Qfl/rCVQBl5Pobd5DTL8x0A+0TBP4O5r5OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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