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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '926a6f56406d4d8e619c4e722cbfcbf5e2c2afc746db0e75414e382a506a46a9' 
  AND token = 'FOoNfITvjKK+a3LGwxw8QJiLnsQ5p6URfCJ3na8ZIis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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