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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4a65c864e32d91f826ced59ed117d4c9f2782ff937302519008cbdb38e06aba' 
  AND token = 'gZCOuzfeltqEXEy6l7pr4wObb4D3SvG8q30uKqqAA2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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