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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f6f8f141d96dc2523a2b97e682d578acc738fc6ba0e7423e3071e39416021df' 
  AND token = 'H5rPEkUJu8qw/xs4U0XniZyeCt0agY1Gx71sm0LnmDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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