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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ce29b6b5576633cb87ee4fdced5443e5840779d4d5497a47cd9c572cb974fa' 
  AND token = 'MWfJcJrdPP9b0rNdl7rdNr8YQwDMDkI+Hs3AyGvU7iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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