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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c4fe9fb45f18294e964dc879ff770494760339cf98c821d64fa968ff3c4899e' 
  AND token = 'LlUrwJtp0aOP+yDh5FLqYXiRHcjskTa1AoYBgQN8ne8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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