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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae0129043125d0088e47555654494ed4cc0c107c3bb71d14aeba6c9121820368' 
  AND token = 'ixDouCE+uKB8dZcuBF0uQ8esT641hjsIhA8arvj45Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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