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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75bdd71336b89952578a7aa83807f2e69c4ba1ff1b92f837170a38784e3b2b7c' 
  AND token = 'OfJzCXvrDnfvbNrJl3V2VmUE2EZxlUsqX9F2INps5yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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