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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddb733fbaafdb2e85a6b3a99613756013420863962c21cf3abf2107f3f311767' 
  AND token = 'TSpOv4airv0AKbBiq6Agt8by1mlFab59agOY83PDuog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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