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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1323e4c3151053bb50043dcdd35ab9617cef31ee8b25eedc399b0baa4216f3f' 
  AND token = 'Iv6KkVxAtfTc/Rsmt8sM/IwYa/pcRBfNbZLS/CRcUNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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