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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '230847be9aabbc8fbd30f7e9a6c8ef9ee85c2f86eb6878e60eaf4fd5f0eea50b' 
  AND token = 'MSK2x6KLFSoqe4O13YwpGxk+HqQjXi/1DE8O83vXoko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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