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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f19e4d5e48a5d4b97eceff0ca9e8dd1270ffb3b7ef712adf6cd6022ae3569dbc' 
  AND token = 'nlzDae/CCatoqKeTc+Zq6Osx1Dd0YLbgW85ujU5esBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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