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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64d66f63cf6bfb21fe982b8a0f5ebf4a89385eaecd57bbece31e4037d6230ec4' 
  AND token = 'BxSA9Tp4TX1fEYkuJVLC1Ddv9tSN+4LxR8OtQXf+z3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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