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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c657f120dbc596e1aa40c7e77d7a2550bd596a7f4a6db347dfd214a1ff815cc' 
  AND token = 'AMVldLWbFWBKOdFFYHjNEiZgF7VngySssf1nw55Wn6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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