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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57ddc168ddca773efdf8bdd3127bf7bde3206d598cc9d8a77527cf2a32d7b7a6' 
  AND token = 'TeWXYXGCa7AYvYgPc7Kbu7Dht6xDpc872NerYRG0cn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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