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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7489a4142179ae6f98c0d46d031c8b97f05a676e620e269e38452fe0e9c356f8' 
  AND token = '5g/2EUON0cQZTVwtyp0cXIWEznycVP/rv2yET7V6/hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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