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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cab486b24512040a0389e0191499be8238464ef450cef9e24ef54309f7f7110f' 
  AND token = 'X/Asp00o/9qIWOsr/VW+22X/aGG7gjDFEiEXQzywZCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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