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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fce70ea32e30fd02fdbafcdf77c492986030ed564d60f0caef1740e46138188' 
  AND token = 'Ou/jv2HbyiWDyJaOFaoQBMSknTM992z761iA2JmD0CE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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