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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf4c95eed3edc36b89b894fab3283d4994f32427b324d0ee88bc9f0addf6bc54' 
  AND token = 'bjDLzQ7R92IFrb9FAQweNsZLfIep2Uk2JZpk9DjSMcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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