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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '810f25f9e8f36d2e9cdd508793dde37dedd21da625fe4398610d2812236ea6cb' 
  AND token = 'AnLd49KiHGpDxCoOuTF9Gep4+7w2xvKoUzamRqJI6PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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