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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e83de3524696116b2d71e770b0e041cad109656d5c0459e893ccc84ff1f7eb2' 
  AND token = 'CAoBww1HUQJl2B1U1dqeWv9x8mAOVpQxEIzv+SMA2EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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