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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3777084b45b2f79f04c3adf44d45cbb7e9f3fae9d4de00398440c735d1f3c63b' 
  AND token = 'OhTt3qTLyH3zrCyQB0Wnx28GaSOpZFTditYfB9DvLN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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