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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9f834852f9a2297d2f45d625a4d03da64118d455d006cc10f1e9b4a8309c5ee' 
  AND token = 'lV8VNiI+2CV/vLd0seaOgb7SQTOL1yRjK9s1Z7gp+g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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