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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e8edbc744cd4eee2def665378c6af37b3194ea514a42d555aa11dbe82b32215' 
  AND token = 'WG5+63DBVYoOM4H6IhzyZkMc5H+u/7qXTNec5kEJvSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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