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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c06397a861f26d28186144b31121fff0542ee096290f634ef6968ea63eb13dfa' 
  AND token = '8zXI2WphCOYH+goQD1eF/WoeL2yK9Q9tP+aKPi7qm9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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