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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b785ef5f5bb2d037c6e9178f75ef90413d3477dffa683b2e7fc74f8eedd3ccb' 
  AND token = 'd3eTRK0i9qgMyJLc7XjD+6vNEwm4Xe67sdSbMvAaCCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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