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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9dc389f29c1d15b35a39ad65d958f95edcda5e0b30dba56f60beb2efe4506fb' 
  AND token = 'HvBkgSMZTsC+dt6ILByPomAjXUxqRruIIMCHE6ti2Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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