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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33cf6be373c28aca2f5f305ea94fc36a846b6e05c374646b3b54b626872a38d3' 
  AND token = 'YbJJudUgMmJ/qYdRtBlpIr9ZUc3bfnJ/cvGh1PUyNok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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