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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b482e404abeb63e009d4c0eea2f1aab3a1bb1bc357abb48c12ab74de4660173a' 
  AND token = 'iyL7hY4IuWrEHXY0ot24/iCymIZwKgd3h/Hccb+q+MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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