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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '853844c1e9455d19d642117fbffd0957b3f6178a111ce6698381120f2bebba95' 
  AND token = '+6qLqjLOrrIfvIWpKcHIf0Rry03XcRG9EiP3eYiwddE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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