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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23f7359f1ab3582f8f77dc0c32e8b33e8d54218cc89380129baf6234a1a65163' 
  AND token = '5QmSPmYNNWnJ6LByQX3OUuxitju1knz5gE9daZF4deo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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