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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8979eb37d1e662158ada6991278071f69bbc5b6b0e95b25af6076e3685e9a3f0' 
  AND token = 'eW5MMqQTH6PZyVOtJe2lVpYQHpG7UikNvuEZln9emNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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