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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15b496cd9514af7ac52482f205f199657e0d1585c72f49a83a0522ff01c5c821' 
  AND token = 'HehoT0LgMT5qTWR9f6DMPPdB2NOVwgcG9hAUJomQXv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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