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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '562d351a61518528605c297d59235455968b02f19ae3b173048357cefe54ef01' 
  AND token = 'vhKRneRNo98GavVCLGU7FEJCtG8yt3IiA9PS7Ft+1+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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