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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '364a762bc3a8f7e2f8cd9af51b63024f4f6d410f4cf410e4a2c74f16a669f4b0' 
  AND token = 'slpCxwWr4IokLmfUe9YBAlt8e1QFOQBXFpoPHrAoKbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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