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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c76bf3385fb4b21e2d70084903a4babb5d3a09bbc27eea6e5815d4c5a59caec' 
  AND token = 'Eu4xNN8/XgD7LCWQ3XZKmsE5UpTE/NwPO6h6tin2zhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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