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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68ea4c30928338286eb7edc771da86d69d032a4510fa03aa228929d604476b6f' 
  AND token = 'FswDgSUOESLxhM1+TH+C4EjgFsmk7XoxsMBcoWTord4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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