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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '622a44ef096f4cfb227381f30e9940bfb7e269f5ed699405934da884b6d7654f' 
  AND token = 'Ud894ylwZqejiezKJnoeH/m8GR9cnLyOOyWxvU5uZfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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