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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68611f223ae27e6594f3f76995a9ccf268cd95885671a466d9986b3ce453aedb' 
  AND token = 'Pt+TDin4Fj11tBM1uH3rtmA0GdEmbSl0uObpWJm4JSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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