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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ac4ebdd5797b5fdda03e42b5e862f2a6656592b21feae82bed20c26f44e5e3' 
  AND token = 'GZperiRHACssGH1N+O40qtNxT6OhQJ58vI6zAdzBPlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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