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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd703ab3a1a1ecfd240333dc79c96f793ae6a4f49fb2c457289e5b4e3a6730c55' 
  AND token = '2OrgwD3v3rQcLi83aHpG6uJd5LOdaxp8QmY93VLYjTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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